HETERONUCLEAR DECOUPLING IN ROTATING SOLIDS
HETERONUCLEAR DECOUPLING IN ROTATING SOLIDS
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DOI：
10.1063/1.470372
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发表时间：
1995-10-22
影响因子：
4.4
通讯作者：
GRIFFIN, RG
中科院分区：
文献类型：
--
作者：
BENNETT, AE;RIENSTRA, CM;GRIFFIN, RG
一种简单的双脉冲相位调制（TPPM）方案极大地降低了在双共振魔角旋转（MAS）实验中由于质子去耦功率不足而产生的剩余线宽。对序列中脉冲长度和相位的优化在高磁场下的较宽旋转速度范围内，使稀核自旋（例如，C - 13）的分辨率和灵敏度都有了显著提高。通过解析和数值方法探讨了自旋之间大的同核和异核相互作用以及MAS施加的幅度调制所带来的理论复杂性。据我们所知，在经历样品旋转的强耦合同类自旋系统中，这种方法是首个在性能上优于连续波（cw）去耦的相位切换序列。（C）1995美国物理学会
A simple two pulse phase modulation (TPPM) scheme greatly reduces the residual Linewidths arising from insufficient proton decoupling power in double resonance magic angle spinning (MAS) experiments. Optimization of pulse lengths and phases-in the sequence produces substantial improvements in both the resolution and sensitivity of dilute spins (e.g., C-13) over a broad range of spinning speeds at high magnetic field. The theoretical complications introduced by large homo- and heteronuclear interactions among the spins, as well as the amplitude modulation imposed by MAS, are explored analytically and numerically. To our knowledge, this method is the first phase-switched sequence to exhibit improvement over continuous-wave (cw) decoupling in a strongly coupled homogeneous spin system undergoing sample spinning. (C) 1995 American Institute of Physics.